Flame of Purification

At the beginning of your upkeep or
whenever you cast a red or white spell, put
a charge counter on Flame of Purification.
Then if there are four or more charge
counters on it, you may pay {1}{r}{w} and
sacrifice it. It deals damage equal to the
number of charge counters on it to each
opponent and you may exile target artifact
or enchantment.